monkeyjb1988
Lurker
I think it is a celebration of the past Super Sentai series, plain and simple. By henshin into past sentais, the fans will get to see their favorite sentai characters making an appearance again, albeit by a member of the Gokaigers (hence the gender-bending). It will also introduce many new or young fans, who never watched the older sentai shows, to see them in action for the very first time.
I enjoy the whole transforming into old heroes. It's cool as long as they don't use the old powers more than their own. Like someone else said, it's a great way to introduce new fans to older heroes. One look at Captain Marvelous and Co kicking rear as Goranger, a young fan is going to want to know more about the original Goranger, although they may wonder why Yellow ain't a girl. If it gets Sentai more fans, more power to them.
Part of it I think might be the sort of wish-fulfillment of being able to henshin into whatever your favorite Sentai heroes are. So to some extent Decade or GoKaigers are a kid (or hell even an older fan) with his toys only wouldn't it be awesome if they actually worked or if you had a toy that would let you be whatever hero you wanted.
"Hey, I feel like being Kuuga today....awesome!"
Wow, way to accurately describe Ryouta Murai (Kamen Rider Kuuga from Decade). It's known that he was a fan of the original Kuuga and and was like this :castlerock: when he was cast as the new Kuuga.
As for why not just get the original actors making a cameo instead, well they are doing it (like MagiRed in episode 3), but to assume that they can build a show around cameo appearances is rather naive and ludacrous. Most of the actors of the past sentai series are either too old, left the show business completely, have committment elsewhere, or even deceased. They'd have to recast them like they did in Kamen Rider Decade, and would the fans really want to see new actors playing those iconic roles and not the original actors themeselves? I think Toei has done an excellent job with Gokaigers, and I won't change a thing.
There also may be some who want nothing to do with Sentai. Cameos are cool, but I rather they save them for the team-ups (although I certainly won't complain about any cameos in the series :laugh